Controlled degradation of polypropylene

A discussion is presented of the two general categories of the degradative process: thermal degradation and peroxide-promoted degradation. The properties of controlled-rheology polypropylenes are examined. It is shown that as a result of the changes in the MWD, the polymers produced exhibit reduced viscosities and higher melt index values. The narrowing of the MWD and the elimination of the high-molecular-weight species result in a more …